>>> tomorrow night man on a mission, newark mayor cory booker is in the middle of his food stamp challenging living one week on food stamps. he'll join me to talk about it that exclusively tomorrow. that's cory booker tomorrow night. it should be fascinating. that's it for us tonight. "ac 360" starts now. >>> piers, thanks. it's 10:00 here on the east coast, and we begin keeping them honest, looking for facts and not trying to take sides. our goal is real reporting, finding out the truth. all calls out hip pock see. this is a baffling case of flip-flopping. this is a story we reported last night and is stranger the more we look into it. it's a long story, but stay with us. on tuesday the senate rejected a u.n. treaty aimed at protecting the rights of disabled people around the world. 125 other countries ratified this, but in the full senate 38 republicans voted no leaving the treaty five votes short of ratification. what we learned today that's interesting is some of these same senators actually supported the treaty before they voted against it. some even pledged their support very publicly.